Vol. 38, Issue 1, pp. 203-210 (2008)

Abstract

Energy transfer processes from Cr³⁺ to Nd³⁺ and NIR luminescence of Nd³⁺ ions at 1.06 μm in Cr–Nd co-doped lead borate glasses have been investigated. The spectroscopic investigation indicates that Cr³⁺ ions are located at strong-field and weak-field sites. Replacing PbO by PbF₂ in lead borate glasses slightly influences the energy transfer processes between Cr³⁺ and Nd³⁺ and NIR luminescence of Nd³⁺ ions. The energy transfer process occurs in both oxide and oxyfluoride glass systems, which may be due to the thermally induced population of the ⁴T₂ excited state of Cr³⁺ ions and the participation of lattice phonons.